Home / 3,119.85-4,679.77-811.35

Finding the Fourth Proportional to 3,119.85, 4,679.77 and 811.35

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Solution

The fourth proportional to 3,119.85, 4,679.77 and 811.35 is: 1,217.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,119.85 : 4,679.77 = 811.35 : x
  2. Step 2: Convert to fraction form
    3,119.85/4,679.77 = 811.35/x
  3. Step 3: Cross multiply
    3,119.85x = 4,679.77 × 811.35
  4. Step 4: Simplify right side
    3,119.85x = 3,796,903.93
  5. Step 5: Solve for x
    x = 3,796,903.93/3,119.85
  6. Step 6: Final answer
    x = 1,217.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.